Suction couch-roll.



F. H. HOBERG & C. C. THOMAS, JR.

SUCTION COUCH ROLL.

APPLICATION FILED APR.19. 1912.

1,159,381. Patented Nov. 9, 1915.

3 SHEETSSHEET I.

F. H. HOBERG & C. C. THOMAS, In.

SUCTION COUCH ROLL.

arrucmou FILED APR. 19. 1912.

1,159,381. Patented Nov. 9, 1915;

3 SHEETS-SHEET 2- Snow/ :01

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F. H. HOBERG & C. C. THOMAS, JR.

SUCTION COUCH ROLL.

APPLICATION FILED APR. 19. 1912.

1,159,381. Patented Nov. 9, 1915.

3 SHEETSSHEET 3.

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rum: 1:. 1101mm Ann-commons 'rnouas, an, or (menu any, wrsoonsnr.

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county of Brown, and State of Wisconsin,

have invented new and useful'lmprovements in Suction Couch-Rolls, ofwhich the fol-- lowing is a specification.

Our invention relates to improvements in couch rolls for aper makingmachines.

The object of our invention is to prov de an improved suction couch rollin which the pressure will be evenly distributed over the whole widthand length of that portion erence characters throughout the several' ofthe roll which is covered with the carrier apron, and in which themoisture may be withdrawn without damage to the apron or to-theformative portion of the'paper sheet, and whereby dama e to the apronfrom fr1ctional contact wit suction boxes may be avoided.

In the draw'ings -Figure 1' is a diagrammatic view, illustrating ourcouch roll in its proper relation to the pulp receiving apron of a papermaking machine. 'Fig. 2 is an end view, part in section, of a couch rollembodying our invention. Fig. 3 is a front elevation, part in verticallongitudinal section, of a couch roll embodying ourinvention, theperiphery of the couch roll being progressively broken away adjacent tothe portion in, section to show the manner in which the structure isbuilt, up. Fig. 4 is a detail sectional view of a portion of a couchroll, showing a modified form of construction.

Like parts are identified by thesame refviews.

In Fig; I, an-apron A is illustrated in ordinary relation to a cylinderB, couch roll 0, suction box or guide roll D and initial compressionrollers E and F, the apron ex-. tending on the return side over therollers G, H, I, J and K. The member D may comprise the ordinary suctionboxes or it may comprise a guide roll, since with our improved couchroll it isnot essential that a suction box be used. All of the aboveparts may be of any ordinary construction, except as to the couch roll,the specific structure of which will now be described.

Referring to Figs. 2 and 3, it will be observed that our improved couchroll is constructed with the cylinder 1 supported from Specification ofLetters Patent.

' Application filed April 19, 1918. Serial 170. 691,988.

Patented Nov. 9, 1915.

a tubular shaft 2 by radial tubular arms 3.

The ends of the tubular shaft 2 are mounted in' supporting bearings 5.At one end the shaft 2 "extends through the bearing member 5, and isconnected with a suction pipe 7. A coupling 8 allows shaft 2 to rotateindependently of suction pipe 7.

The cylinder 1 is provided with annular flanges 9 on its periphery whichsupport an annular series of rods 10, the ends of which are received inflanged collars 11. This series of rods 10 is covered by coiled wire 14which is preferably wound around the cylinder in a helical coil, and iscovered by wire netting 15. The wire netting 15 is jacketed with a heavyfelt covering 16, the ends of which are preferably turned inwardly at 17and engage between the flanged collar 11 and a clamping collar 19 whichis bolted at 20 to the head piece 21. The flanged collar 11 has screwthreaded engagement with this head piece and the ends of the cylinder 1are mounted on inturned head flanges 23.

With the abovedescribed construction, it will be observed that thejacket or peripheral felt covering of the couch roll is supported fromthe cylinder 1 by the flanges 9 and rods 10, together with the coiledwire 14 and wire netting 15 which cooperate to prevent the felt coveringor jacket from being depressed into the spaces between the rods 10.There is, therefore, an annular open space between the cylinder 1 andthe jacket 16, unobstructed except by the flanges 9, rods 10 and thewire coil and net. The flanges 9 are provided at intervals withapertures 26 which allow water to flow along the surface of the cylinder1 to .the tubular radial arms 3. The tubular arms 3 therefore serve thetriple purpose of supporting the cylinder 1 from the tubular shaft 2, of

providing drainage for thespace between the cylinder 1 and the outerjacket, and of extending the vacuum produced by suction exerted throughthe pipe 7 into said space. The heavy jacket 16, which forms theperiphery of the roll, so far obstructs the passage of air into thespace between it and the cylinder 1 that a suflicient suction will bemaintained through that portion of the periphery of the roll which iscovered by the apron or carrier A, as shown in Fig. 1. The water willtherefore be withdrawn from the pulp sheet through the apron A andthrough the jacket 16 into the annular suction space of the couch roll,and from this space it will be drained through the radial tubes 3 andtubular shaft 2 to the pipe 7.

The construction shown in 'Fig. 4: is the same as that shown in theother views, except at the ends of the couch roll and within the tubularshaft 2. In Fig. 4, the shaft 2 is provided with rotary cylindricalvalves 30, having ports 31 adapted for registry with radial tubular arms3. The valves 30 are also provided with ports 32 in position forregistry with one of the arms 3*. One of these valves 30 is actuated bya rod 35 and the other valve 30. is actuated by a sleeve rod 36, throughwhich rod 35 may extend in order that both rods may be actuated from thesame end of the roll.

The flanges 9 on the cylinder 1 adjacent to the ends of the cylinderextend outwardly from the cylinder a little farther than the flanges 9and are notched to receive the rods 10 to such a depth that the wire andfelt.

coverings may bear directly on the peripheries ofthe flanges 9 Theseflanges 9 have no openings corresponding with the openings 26 in theflange 9 and it therefore follows that said flanges 9 constitutesubstantially complete partitions for the space between the cylinder 1and the outer coverings, subdividing said space into annular cavities 38and 39 respectively at each end of the roll. When the cylindrical valves30 are rotated to closed position, the air will notbe exhausted from.the spaces 38 and 39.

By rotating the valves 30 until the opening 32 is in registry with theinner tube 3*", the vacuum will be extended to the cavity 39, and byrotating the valves 30 until the openings 31 are in registry with thetubular arms 3*, the vacuum will be extended to both cavities 38 and 39.Inthis manner, we are enabled to, increase or diminish the length of thesuction area of our couch roll. When running narrow strips of paper, thevalves will be rotated to cut off the suction from cavity 38, or fromcavities 38 and 39. For example, assuming that the strip of paper is ofa width'substantially equal to the distance between the inner flanges 9the valves will be adjusted to cut off the suction from both cavities 38and 39, whileif the strip is of a width equal to the distance betweenthe outer flanges 9 the valves 30 will be adjusted to cut off thesuction from the cavities 38, ports 32 of the valves being in registrywith the cavities 39 to permit the vacuum to extend thereto. It will ofcourse be understood that any desired number of these independentannular cavities may be provided and the suction applied or cut off bymeans of suitable valve mechanism.

The valves 30 are preferably provided with segmental guide channels 40into which bular shaft 2, whereby the rotative movement of the valves 30may be limited.

We claim 1. A suction couch roll comprising a cyllnder, a jacket adaptedto absorb moisture by capillary attraction and by suction, enclrclingsaid cylinder and spaced therefrom, crossed reinforcing members vsupporting sald jacket from the cylinder at all points and adapted toprevent the formation of hollows or channels in the outer surface ofsaid jacket, said cylinder being provided with a suction duct leadingfrom the space between the cylinder and jacket.

2. A suction couch roll comprising a closed cylinder provided withannular peripheral ribs, an annular series of jacket supporting rodsmounted on said ribs, a netted covering for said rods, a jacket ofnon-metallic absorbent material. inclosing the netted covering andforming the periphery of the roll, and means for applying suction tothespace between the jacket and cylinder.

3. A couch roll consisting of the combination of a tubular shaft, aclosed cylinder supported by said shaft, tubular radial armscommunicating between the interior of the shaft and space exterior tothe periphery of said cylinder, a series of annular apertured ribsmounted upon the periphery of said cylinder, a seires of rods connectedwith the cylinder at their respective ends and having their intermediateportions supported by said ribs, a perferate metallic covering for saidrods and a felt jacket mounted upon said metallic covering and held incylindrical form thereby.

4. A suction couch roll provided with a jacketed periphery, of absorbentmaterial, means for supporting said jacket in true cylindrical form,said roll having an annular suction cavity immediately underneath saidjacket.

5. Asuction couch roll comprising a closed cylinder, a set of annularribs encircling said cylinder at spaced intervals and having outwardlyconverging walls, sets of rods superposed with those of one set crossingthose of the next set, the rods of the successive sets beingprogressively smaller in diameter and greater in number and in proximityto each other, a. jacket composed of' nonmetallic fabric encircling theouter set of rods, and means for applying suction to the space betweenthe jacket and the cylinder, said outer sets of creased rods being ofsuch size and arranged in such proximity as to form a substantiallycontinuous support for said covering while erasing substantially inder,an absorbent severing for the cylinstop projections 41 may extend fromth er s aced therefrom, means for withtherefrom and composed 0 tubesexten drawing fluid from the s ace between the cylinder and covering, ana set of annular v the cylinder, a peripheral jacket of nonme'tallicabsorbent material encircling the cylinder and spaced therefrom, valvesin the shaft adapted to close and open communication with some of saidsuction tubes, and annular partitions subdividing the space between thecylinder and jacket.

In testimony whereof we afiix our signatures in the resence of twowitnesses.

FR NK H. HOBERG, COMADORE O. THOMAS, JR. Witnesses:

AUG. HEMMINGREN, ALPI-IONSE Dn-Gnoor.

